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U.S. President Barack Obama (2L) and U.S. first lady Michelle Obama (R) welcome Canadian Prime Minister Stephen Harper (L) and his wife Laureen Harper to the opening dinner for G-20 leaders at the Phipps Conservatory on September 24, 2009 in Pittsburgh, Pennsylvania. Heads of state from the world's leading economic powers arrived today for the two-day G-20 summit held at the David L. Lawrence Convention Center aimed at promoting economic growth. UPI/Win McNamee/Pool
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